Il A heavy ball with a weicht of 100 N (m 10.2 kg) is hung. from the ceiling of a lecture hall on a 4.5-m-long rope. The ball. is pulled to one side and released to swing as a pendulum, reach-. ing a speed of 5.5 m/s as it passes throuoh the lowest point.
Inventions. The huochong gun was invented in China during the Ming dynasty. It was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.t was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.
7 Things You May Not Know About the Ming Dynasty. At its peak, the Ming dynasty made China a global superpower, influencing the known world in trade, culture and might. It spanned nearly 300 years, from the fall of the Mongols in 1368 to the ascendancy of the Manchus in 1644. Here are seven things you might not know about the Ming era.